LOCATION STOUT NM+COEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive, frigid Lithic Haplustepts
TYPICAL PEDON: Stout cobbly sandy loam in forest. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 1 inch; decomposed and undecomposed forest litter. (0 to 2 inches thick)
A--1 to 4 inches; grayish brown (10YR 5/2) cobbly sandy loam, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; many fine roots; many very fine pores; 15 percent cobbles; moderately acid; clear smooth boundary. (2 to 6 inches thick)
Bw--4 to 17 inches; very pale brown (10YR 7/4) cobbly sandy loam, yellowish brown (10YR 5/4) moist; massive; soft, very friable, nonsticky and nonplastic; common fine roots; few very fine tubular pores; 20 percent cobbles; moderately acid; abrupt wavy boundary. (4 to 14 inches thick)
2R--17 inches; sandstone, weathered in the upper part.
TYPE LOCATION: Colfax County, New Mexico; about 16 miles west of Raton; 850 feet north and 30 feet west of the Armstrong Lookout; lat. 36 degrees 26 minutes 25 seconds N. and long. 107 degrees 00 minutes 57 seconds W.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is intermittently moist in some part December through April and July through October; Ustic moisture regime, typic subclass.
Mean annual soil temperature: 42 to 47 degrees F
Mean annual summer soil temperature: 54 to 58 degrees F
Depth to lithic contact: 10 to 20 inches from the mineral surface to sandstone
Thickness of the Ochric epipedon: 2 to 6 inches
Particle-size control section (weighted average):
Clay content: 5 to 15 percent
Rock fragments: 0 to 30 percent
A horizon:
Hue: 7.5YR to 10YR
Value: 4 to 7 dry, 3 to 6 moist
Chroma: 2 to 4
Rock fragments: 0 to 30 percent gravel, cobbles, channers, or flagstones
Reaction: moderately acid to neutral
Bw horizon:
Hue: 7.5YR to 10YR
Value: 4 to 7 dry, 3 to 7 moist
Chroma: 3 or 4
Texture: sandy loam, fine sandy loam, or loam frequently modified by rock fragments.
Rock fragments: 0 to 30 percent gravel, cobbles, channers, or flagstones
Reaction: moderately acid to neutral
COMPETING SERIES: These are the
Escrito and Modo series.
Escrito soils: have a significant decrease in precipitation in
May and June (Stout soils have a distinct peak of precipitation in July and August and lack the decrease in April through June).
GEOGRAPHIC SETTING:
Parent material: colluvium, slope alluvium, and residuum derived from sandstone
Landform: ridges, hills, mountains, and mesas
Slopes: 1 to 45 percent
Elevation: 6,800 to 9,000 feet
Mean annual temperature: 40 to 46 degrees F
Mean annual precipitation: 16 to 20 inches
Precipitation pattern: precipitation is relatively evenly distributed throughout the year, with usually more than 60 percent falling during the frost-free period
Frost-free period: 75 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dargol, Midnight, Rocio, Rombo, and Vamer series. Dargol, Rombo, and Vamer soils have more than 35 percent clay. Midnight soils have more than 35 percent rock fragments. Rocio soils lack a lithic contact within a depth of 20 inches.
DRAINAGE AND PERMEABILITY: Well or somewhat excessively drained, very low to medium runoff, moderately rapid or rapid permeability.
USE AND VEGETATION: Wildlife habitat, recreation, timber production, rangeland, and watershed. The potential vegetation is ponderosa pine, twoneedle pinyon, oneseed juniper, oak, mountain mahogany, mountain muhly, pine dropseed, blue grama, muttongrass, sideoats grama, and little bluestem.
DISTRIBUTION AND EXTENT: Northern New Mexico, southern and western Colorado; LRR E, MLRA 47 and 48A; This series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Colfax county, New Mexico, 1974.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 1 to 4 inches. (A horizon)
Cambic horizon: The zone from 4 to 17 inches. (Bw horizon)
Lithic contact: The contact with sandstone at 17 inches. (2R horizon)
The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.
Current definitions of a cambic horizon necessitated the reclassification of this series from an Ustorthent to a Haplustept.
Further study is needed to properly separate this series and the competing Escrito series.
Taxonomic Version: Tenth Edition, 2006.